Towards Readable Layouts for Modeling Data Warehouses

Jesús PardilloUniversity of Alicante, Spain

jesuspv@ua.eswww.jesuspardillo.com

Florian MansmannUniversity of Konstanz, Germany

Florian.Mansmann@uni-konstanz.deinfovis.uni-konstanz.de/members/mansmann

2J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Garrigós et al.(ER’09)

3J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Level Attributes(Product)

Fact Measures(Sale)

Fact Granularity(Sale)

Dimension Hierarchies (Store)

Schema Dimensionality DimensionAttributes

(Store)

4J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

is more readable than

Research Hypothesis

5

Research Outline

‣ Materials:

✓ Viewpoints

✓ Graph layouts

✓ Readability measures

‣ Method:

✓ Expert Measurement

‣ Findings:

✓ Readability evaluation

✓ Readability by viewpoint

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

6J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

is indeed more readable than

Conclusion

7

Research Outline

‣ Materials:

✓ Viewpoints

✓ Graph layouts

✓ Readability measures

‣ Method:

✓ Expert Measurement

‣ Findings:

✓ Readability evaluation

✓ Readability by viewpoint

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

8

Attributionof a Level

Granularityof a Fact

Measurementof a Fact

Attributionof a Dimension

DimensionalityAggreg. Hierarchies

of a Dimension● ● ● ● ●

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Garrigós et al. (ER’09)

9

Attributionof a Level

Granularityof a Fact

Measurementof a Fact

Attributionof a Dimension

DimensionalityAggreg. Hierarchies

of a Dimension● ● ● ● ●

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Garrigós et al. (ER’09)

10

Attributionof a Level

Granularityof a Fact

Measurementof a Fact

Attributionof a Dimension

DimensionalityAggreg. Hierarchies

of a Dimension● ● ● ● ●

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Garrigós et al. (ER’09)

11

Attributionof a Level

Granularityof a Fact

Measurementof a Fact

Attributionof a Dimension

DimensionalityAggreg. Hierarchies

of a Dimension● ● ● ● ●

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Garrigós et al. (ER’09)

12

Attributionof a Level

Granularityof a Fact

Measurementof a Fact

Attributionof a Dimension

DimensionalityAggreg. Hierarchies

of a Dimension● ● ● ● ●

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Garrigós et al. (ER’09)

13

Attributionof a Level

Granularityof a Fact

Measurementof a Fact

Attributionof a Dimension

DimensionalityAggreg. Hierarchies

of a Dimension● ● ● ● ●

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Garrigós et al. (ER’09)

14

Arc Diagram Cross-tab

+

+

+ +

+

StackMesh

ParallelCo-ordinates

Radial

Tree Table

Tree

Graph Layouts

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

15

Layouts by Viewpoint

attribution by level

dimensionality

attribution of a dimension

measurement of a fact

granularity of a fact

aggr. hierarchies

of a dimension

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

16

‣ Continuity:

‣Orthogonality:

‣ Proximity:

‣ Symmetry:

‣ Density:

‣ Edge Overlap:

‣ Fast Traversal:J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

Rea

dabi

lity

Mea

sure

s

17

Readability Evaluation

continuity

orthogonality

proximity

symmetry

densityedge overlap

fast traversal

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

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Readability by Viewpoint

attribution by level

dimensionality

attribution of a dimension

measurement of a fact

granularity of a fact

aggr. hierarchies

of a dimension

J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

19J. Pardillo & F. Mansmann: Towards Readable Layouts for Modeling Data Warehouses. DOLAP’10

is indeed more readable than

Conclusion